The security guard who bravely confronted the Las Vegas shooter, alerting others to his location, has spoken out for the first time. Jesus Campos talked to Ellen DeGeneres in an interview that's slated to air Wednesday. He was the first person to confront the gunman inside the Mandalay Bay hotel.

"I'm doing better each day. Slowly but surely, just healing physically and mentally," Campos, who was wounded by the gunman, told DeGeneres, CBS News reports. A cane was by his side.

The security guard was investigating an open door on the 32nd floor when he noticed something strange.

"There was a metal bracket holding the door in place," Campos said. That door was outside the gunman’s room.

"When you saw that, did you think that's weird, why would somebody put brackets on a door?" DeGeneres asked.

"That's just out of the ordinary," Campos replied.

He called security dispatch to alert them of the situation. He then walked through the open door, which he let slam behind him. That slamming sound likely caught the shooter’s attention.

"As I was walking down, I heard rapid fire and at first I took cover. I felt a burning sensation. I went to go lift my pant leg up and I saw the blood. That's when I called it in on my radio that shots had been fired.”

Building engineer Stephen Schuck was sent up from security to check on the door.

"Jesus, he leaned out and he said take cover, take cover and yelled at me and within milliseconds, if he didn't say that, I would've got hit," Schuck said.

Fifty-eight people were killed that night, in what has been called the deadliest shooting by a solo gunman in American history. Campos has been credited with possibly saving hundreds of lives.

"I just want to mention all the people that assisted that night, whether it was Metro, the FBI, the community especially coming out together to help everyone in need. Everyone came together to help that night even in the darkest hour," Campos said.

DeGeneres said that both Campos and Schuck turned down cash rewards from the show.

According to the Associated Press, there has been a lot of speculation and curiosity about Campos after he canceled interviews about the shooting last week. He was reportedly in hiding.

https://t.co/j3dQrizvNW🇺🇸Jesus Campos' disappearance in Las Vegas is causing more and more speculation and conspiracy theories. Where is he? Is he with the FBI? Is he under a gag order as well? Were there other shooters? Why the secrecy? #FBI#Answers?🇺🇸